Geared wrench



Dec. 11, wzs. 1,477,448

7 J. A. ROBERTS GEARED WRENCH Filed April 6. 1922 2 Sheets-Sheet 1 Deco 111 1923.. 11,477,448

J. A. ROBERTS GEARED WRENCH Filed April 6. 1922 2 Sheets-Sheet 2 Patented Dec, ill, 1923,

untrue JOHN-A. ROBERTS, O1" RQLFE, IGJVA;

GEAR-ED WRENCH.

. Application filed April 6,

To aZZ w 710% it may concern Be it known that 1, JOHN A. ROBERTS, a. citizen of the United States, residing at Rolfe, in the county of Pocahontas and. State of Iowa, have invented certain new and useful Improvements in Geared Wrenches; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

The primary object of the present invention is the provision of a wrench designed particularly for bridge work, and which may be used to equal advantage in railroad shops, car shops and construction works where the nuts are of a uniform size and a powerful leverage is required to tighten the nuts which usually are disposed in places not readily accessible.

Other objects and advantages will'be apparent and suggest themselves as the nature of the invention is understood.

While the drawings illustrate an embodiment of the invention it is to be understood that in adapting the same to meet different conditions and requirements, various changes in the form, proportion and minor details of construction may be resorted to without departing from the nature of the invention.

Referring to the accompanying drawings forming a part of the application,

Figure 1 is an elevation of a wrench embodying the invention, an intermediate portion being broken away,

Figure 2 is a view similar to Figure 1 partly in section and with the near plate removed,

Figure 3 is a section on the line 33 of Figure 2, looking to the right as indicated by the arrows,

Figure 4 is a front end view of the wrench head,

Figure 5 is a section on the line 55 of Figure 2, looking to the right as designated by the arrows,

Figure 6 is a detail section on the line 66 of Figure 2,

Figure 7 is an elevation of the forward end of the frame,

Figure 8 is an elevation of the filler between the forward ends of the plates comprising the wrench head,

gigure 9 is a rear end view of the frame, an

Figure 10 is a section on the line 10'10 1922. semi No. 549,991.

of Figure 1, looking to the left as indicated by the arrows.

Corresponding and like parts are referred to in the following description and designated in the several views of the drawings by like reference characters.

The wrench comprises a frame in the nature of a bar 1 which may be of any length and cross sectional outline, opposite end portions being laterally offset, as indicated at 2 and 3, and terminating in bearings 4 and 5, respectively. A filling piece 6 is provided at the outer or forward end of the bar 1 having the bearing 5 and is adapted to be secured between companion plates 7 which form the head of the wrench. A filling piece 8' is likewise secured between the forward ends of the plates 7 and terminate in a bearing 9 which, when the parts are assembled, is in line with the bearings 4 and 5. The companion plates 7 are disposed in par allel relation and are riveted or otherwise secured with the filling pieces 6. and 8 between opposite end portions.

A nut socket 11 is rotatably mounted in the plates 7, the latter being formed with registering openings 10 which snugly receive hub portions of the said socket. The intermediate portion of the nut socket 11 is formed with a worm gear 12 which coacts with a worm 13 of a shaft 14 journaled in the bearings 4, 5 and 9 and prevented from longitudinal play by means of stop shoulders 15 engaging the inner ends of the bearings 5 and 9. A socket head 16 is fast to the outer end of the shaft 14 and receives an operating handle 17. i

The worm gearing enables the application of considerable force to turn a nut, whereby the same may be tightened, and the length of the rod 1 and shaft 14 admits of application of the force to the wrench at a convenient and advantageous point. A wrench of this character is admirably adapted for bridge building in which the nuts and bolts are uniform in size and which admits of the nuts being reached and properly tightened.

What is claimed is:

A wrench having a shaft, a bar substantially of U-shape having its legs relatively short and forming bearings integral therewith at its ends in which said shaft is journaled, said bar intermediate said bearings being offset from the shaft, said bar at one end adjacent the bearing therea't having a filling piece integral therewith and enlarged with respect, to and extending in the opposite direction to the adj aicen-t bearing, plates fastened to said filling piece onopposite sides thereof, a filling piece fastened intermediate said plates at a, distance from the first mentioned filling piece a bearing extending from the second mentioned filiin rpiece, a sockeb member journeled in sand plates, the lasg mentlonedbem'ing extending outwardly In testimony whereof I ZLffiX my signature in presence of two Witnesses.

JOHN A. ROBERTS. I Witnesses i Y W. M. OBREc-HT, J. H. VVILSON. 

